<template>
<div>
    <my-bread level1="商品管理" level2="参数列表"></my-bread>
    <!-- 卡片视图区域 -->
    <el-card>
        <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon>
        </el-alert>
        <div class="block">
            <span class="demonstration">选择商品分类：</span>
            <el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
        </div>
        <!-- tabs标签分页 -->
        <template>
            <el-tabs v-model="activeName" @tab-click="handleTabsClick" class="el_tabs">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <el-table :data="manyTableData" stripe>
                        <!-- 展开列 -->
                        <el-table-column type="expand" width="50">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入Tag文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)" style="width:150px"></el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" width="50">
                        </el-table-column>
                        <el-table-column prop="attr_name" label="参数名称" width="800">
                        </el-table-column>
                        <el-table-column width="300">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <el-table :data="onlyTableData" stripe>
                        <!-- 展开列 -->
                        <el-table-column type="expand" width="50">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入Tag文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)" style="width:150px"></el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" width="50">
                        </el-table-column>
                        <el-table-column prop="attr_name" label="属性名称" width="800">
                        </el-table-column>
                        <el-table-column width="300">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </template>
        <!-- 添加参数对话框 -->
        <el-dialog :title=" '添加' + getTitleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addFrom" :rules="addFromRules" ref="addFromRef" label-width="100px">
                <el-form-item :label="getTitleText" prop="attr_name">
                    <el-input v-model="addFrom.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 编辑参数对话框 -->
        <el-dialog :title=" '修改' + getTitleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editFrom" :rules="editFromRules" ref="editFromRef" label-width="100px">
                <el-form-item :label="getTitleText" prop="attr_name">
                    <el-input v-model="editFrom.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </el-card>
</div>
</template>

<script>
export default {
    data() {
        return {
            // 选择商品的数据列表
            catelist: [],
            //选中的商品的cat_pid数组
            selectedCateKeys: [],
            cateProps: {
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            //tabs标签页选中的标签名
            activeName: 'many',
            // 动态参数表格数据
            manyTableData: {},
            // 静态属性表格数据
            onlyTableData: {},
            //   控制添加参数对话框的显示与隐藏
            addDialogVisible: false,
            //   添加表单的数据对象
            addFrom: {
                attr_name: ''
            },
            //   添加表单的验证规则
            addFromRules: {
                attr_name: [{
                    required: true,
                    message: '请输入参数名称',
                    trigger: 'blur'
                }]
            },
            //   编辑对话框
            editDialogVisible: false,
            //   修改表单数据对象
            editFrom: {},
            //   修改表单验证规则
            editFromRules: {
                attr_name: [{
                    required: true,
                    message: '请输入参数名称',
                    trigger: 'blur'
                }]
            }
        }
    },
    created() {
        this.getCateList()
    },
    computed: {
        isBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类Id
        getCateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        getTitleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    },
    methods: {
        async getCateList() {
            const res = await this.$http.get('categories')
            const {
                data,
                meta: {
                    status,
                    msg
                }
            } = res.data
            if (status !== 200) {
                return this.$message.error(msg)
            }
            this.catelist = data
        },
        // 选中的商品变化时执行的函数
        handleChange() {
            this.getParamsData()
        },
        // Tab页签点击事件的处理函数
        handleTabsClick() {
            this.getParamsData()
        },
        //获取参数的列表数据
        async getParamsData() {
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            const res = await this.$http.get(`categories/${this.getCateId}/attributes`, {
                params: {
                    sel: this.activeName
                }
            })
            const {
                data,
                meta: {
                    status,
                    msg
                }
            } = res.data
            if (status !== 200) {
                return this.$message.error(msg)
            }
            data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框的输入值
                item.inputValue = ''
            });
            if (this.activeName === 'many') {
                this.manyTableData = data
            } else {
                this.onlyTableData = data
            }
        },
        // 点击按钮显示输入框
        showInput(row) {
            row.inputVisible = true
            //   让输入框自动获取焦点
            // $nextTick方法的作用：当页面元素被重新渲染之后，才会至指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus()
            })
        },
        // 文本框失去焦点,或者按下Enter触发
        handleInputConfirm(row) {
            if (row.inputValue.trim().length === 0) {
                row.inputVisible = false
                row.inputValue = ''
                return
            }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 提交数据库，保存修改
            this.saveAttrVals(row)
        },
        // 将对attr_vals（Tag） 的操作 保存到数据库
        async saveAttrVals(row) {
            const {
                data: res
            } = await this.$http.put(
                `categories/${this.getCateId}/attributes/${row.attr_id}`, {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(' ')
                }
            )
            if (res.meta.status !== 200) {
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
        // 删除对应的参数可选项
        handleClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        },
        // 监听对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFromRef.resetFields()
        },
        // 添加参数
        addParams() {
            this.$refs.addFromRef.validate(async valid => {
                if (!valid) {
                    return
                }
                const res = await this.$http.post(
                    `categories/${this.getCateId}/attributes`, {
                        attr_name: this.addFrom.attr_name,
                        attr_sel: this.activeTabsName
                    }
                )
                const {
                    meta: {
                        msg,
                        status
                    }
                } = res.data
                if (status !== 201) {
                    return this.$message.error(msg)
                }
                this.$message.success(msg)
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 显示编辑对话框
        async showEditDialog(attrId) {
            const {
                data: res
            } = await this.$http.get(
                `categories/${this.getCateId}/attributes/${attrId}`, {
                    params: {
                        attr_sel: this.activeTabsName
                    }
                }
            )
            if (res.meta.status !== 200) {
                return this.$message.error('获取分类失败！')
            }
            this.editFrom = res.data
            this.editDialogVisible = true
        },
        // 重置修改表单
        editDialogClosed() {
            this.$refs.editFromRef.resetFields()
        },
        // 修改参数
        editParams() {
            this.$refs.editFromRef.validate(async valid => {
                if (!valid) return
                const {
                    data: res
                } = await this.$http.put(
                    `categories/${this.getCateId}/attributes/${this.editFrom.attr_id}`, {
                        attr_name: this.editFrom.attr_name,
                        attr_sel: this.activeTabsName
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！')
                }
                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据Id删除对应的参数项
        async removeParams(attrId) {
            const confirmResult = await this.$confirm(
                '此操作将永久删除该参数, 是否继续?',
                '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }
            ).catch(err => err)
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除！')
            }
            const {
                data: res
            } = await this.$http.delete(
                `categories/${this.getCateId}/attributes/${attrId}`
            )
            if (res.meta.status !== 200) {
                return this.$message.error('删除参数失败！')
            }
            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
    }
}
</script>

<style lang="less" scoped>
.el-card {
    margin-top: 15px;
}

.block {
    margin-top: 15px;
}

.el_tabs {
    margin-top: 15px;
}

.el-table {
    margin-top: 15px;
}
</style>
